Liz and the Blue Bird is a nice spin off of the Sound Euphonium series
Story:
The story in this movie focuses on Mizore and Nozomi instead of Kumiko and Reina from Sound Euphonium. It starts off slow, but then does get moving. There are aspects of the book "Liz and the Blue Bird" and how it relates to the characters when it comes to growing up and parting ways which is well written overall. Music is an important aspect as well.
Animation:
It's notable to mention that the animation is not as well as Sound Euphonium, but still look stunning in it's own way because of its simplicity.
Characters:
We know from Sound Euphonium that even though both are friends, Nozomi is an extrovert while Mizroe is an introvert which appears in Liz and the Blue Bird. Both of their characteristics are interesting to watch as well as how their differences impact their friendship.
Overall this movie did great when it comes to the story, characters, and animation. While this movie isn't required to watch for the Sound Euphonium series, it's a great addition to understanding the side characters more.
9/10